Adjustment feedback mechanism for an injection pen

Abstract

The present application provides a kind of adjusting feedback mechanism of injection pen, including metering scale support and main casing, metering scale support is connected with main casing, when setting dose, metering scale support rotates to first direction, limiting piece is engaged with metering scale support in first position, first feedback mechanism and second feedback mechanism are rotated and feedback is being set dose, when needing to correct set dose, metering scale support rotates to second direction, limiting piece is engaged with metering scale support in second position, so that dose feedback assembly on metering scale support is in the cooperation of limiting piece and is inwards retracted to realize second direction rotation and feedback is being corrected set dose, because dose feedback assembly is inwards retracted, so that when correcting set dose, metering scale support rotates to second direction does not need much effort.

Description

Technical Field

[0001] This invention relates to the field of adjustable metering injection devices, and more specifically, to an adjustment feedback mechanism for an injection pen. Background Technology

[0002] The adjustable metering injection device comprises a dose adjustment mechanism, an injection mechanism, and a cartridge retaining mechanism. When adjusting the dose, the user rotates a dose adjustment element on the dose pouring mechanism. The force applied by the user is stored in a torsion spring. To allow the adjusted dose to be poured out, the user presses a pour button on the proximal end of the syringe. The torsional force accumulated in the torsion spring is then delivered to the drive element to propel the liquid out of the injection device.

[0003] The downward-pushing mechanism of the injection device includes a ratchet arm that engages with teeth on a fixing element. When the dosage setting element is rotated forward relative to the housing, the torsion spring is tensioned to prevent the dosage setting element from rotating in the opposite direction. When the dosage setting element is rotated in the opposite direction, the ratchet arm disengages from the fixing element, allowing the dosage setting element to rotate in the opposite direction. When the dosage setting element rotates forward or in the opposite direction, the ratchet arm and the teeth on the fixing element collide with each other, producing a sound. However, this solution has many problems, including numerous parts, complex assembly, high assembly difficulty, high cost, the torsion spring may break during pre-tensioning, the sound-producing device may cause the rotation of the metering dial to decelerate and then accelerate significantly before the injection ends, self-locking failure, and no venting function. Summary of the Invention

[0004] In view of this, in order to solve the above problems, the present invention provides an adjustment feedback mechanism for an injection pen, including a metering dial support 20 and a main housing 60. The metering dial support 20 is sleeved with the main housing 60. The metering dial support 20 is used to cooperate with the metering dial 10 for dose display during dose adjustment. A screw sleeve 30 is sleeved inside the metering dial support 20. A dose feedback component is provided at the metering dial support 20. A first feedback mechanism 55 is provided at the dose feedback component. A second feedback mechanism 70 that cooperates with the first feedback mechanism 55 is provided at the main housing 60. A limiting member 40 is provided around the screw sleeve 30. The limiting member 40 is partially disposed outside the dose feedback component and has a gap. When the setting is... When setting the dosage, the measuring dial support 20 rotates in a first direction, and the limiting member 40 engages with the measuring dial support 20 at a first position. The first feedback mechanism 55 and the second feedback mechanism 70 cooperate to rotate and provide feedback on the dosage being set. When the set dosage needs to be corrected, the measuring dial support 20 rotates in a second direction, and the limiting member 40 engages with the measuring dial support 20 at a second position. This causes the dosage feedback component on the measuring dial support 20 to retract inward under the cooperation of the limiting member 40, achieving rotation in the second direction and providing feedback on the dosage being corrected. Because the dosage feedback component retracts inward, the measuring dial support 20 does not require much effort to rotate in the second direction when correcting the set dosage.

[0005] An adjustment feedback mechanism for an injection pen includes a metering scale support 20 and a main housing 60. The metering scale support 20 is sleeved with the main housing 60. The metering scale support 20 is used to cooperate with the metering scale 10 for dose display during dose adjustment. A screw sleeve 30 is sleeved inside the metering scale support 20. A dose feedback component is provided at the metering scale support 20. A first feedback mechanism 55 is provided at the dose feedback component. A second feedback mechanism 70 that cooperates with the first feedback mechanism 55 is provided at the main housing 60. A limiting member 40 is provided around the screw sleeve 30. The limiting member 40 is partially disposed outside the dose feedback component and has a gap. When the dose is set, the metering scale... The dial support 20 rotates in a first direction, and the limiting member 40 engages with the metering dial support 20 at a first position. The first feedback mechanism 55 and the second feedback mechanism 70 cooperate to rotate and provide feedback on the setting of the dose. When the set dose needs to be corrected, the metering dial support 20 rotates in a second direction, and the limiting member 40 engages with the metering dial support 20 at a second position. This causes the dose feedback component on the metering dial support 20 to retract inward under the cooperation of the limiting member 40, thereby achieving rotation in the second direction and providing feedback on the correction of the set dose. Because the dose feedback component retracts inward, the metering dial support 20 does not require much effort to rotate in the second direction when correcting the set dose.

[0006] In some embodiments, the dose feedback component includes a spring arm 52 and a first feedback mechanism 55. The first feedback mechanism 55 is a locking tooth located at the free end of the outer wall of the spring arm 52. The second feedback mechanism 70 is a ring of ratchet teeth that cooperate with the locking tooth. A measurement unit is defined as the locking tooth moving from one ratchet tooth to its adjacent ratchet tooth.

[0007] Furthermore, the tooth is provided with a tooth edge section 551 that engages with the ratchet in the first direction. The tooth edge section 551 abuts against one side of the ratchet when the metering dial support 20 is rotated in the first direction, thereby fixing the set dose.

[0008] Furthermore, the angle between the contact surface 71 of the tooth edge segment 551 and the horizontal plane is greater than 45° and less than 90°, to prevent the tooth from rotating in the second direction.

[0009] Furthermore, the locking teeth are provided with a guide surface 552 that guides the ratchet in a first direction. When the metering dial support 20 rotates in the first direction, the guide surface 552 impacts and contacts the other side of the ratchet, causing the locking teeth to retract inward to set the dosage. The impact between the guide surface 552 and the other side of the ratchet also generates a sound indicating that the dosage is being set.

[0010] Furthermore, the angle between the guide surface 552 and the contact surface 72 of the ratchet and its horizontal direction is greater than 90° and less than 180°, ensuring that the ratchet can rotate smoothly in the first direction for dose setting.

[0011] In some embodiments, the junction between the measuring dial support 20 and the limiting member 40 is a groove-shaped structure 21. When the injection pen is not in use, a portion of the limiting member 40 is placed inside the groove-shaped structure 21 and does not contact the two side walls of the groove-shaped structure 21. When a dose is set, the measuring dial support 20 rotates in a first direction, and the limiting member 40 engages with one side wall of the groove-shaped structure 21 at a first position. When the set dose needs to be corrected, the measuring dial support 20 rotates in a second direction, and the limiting member 40 engages with the other side wall of the groove-shaped structure 21 at a second position. This causes the dose feedback component on the measuring dial support 20 to be retracted inward under the cooperation of the limiting member 40, achieving rotation in the second direction and providing feedback on the dose being corrected.

[0012] Furthermore, the portion of the limiting member 40 within the groove structure 21 is a strip column structure.

[0013] Furthermore, only one end of the limiting member 40 is fixed to the outer wall of the measuring scale support 20, while the rest of the part does not contact the outer wall of the measuring scale support 20.

[0014] Furthermore, the outer wall of the dose feedback component is provided with a protrusion 51. When the set dose needs to be corrected, the metering dial support 20 rotates in the second direction, the limiting member 40 contacts the protrusion 51 and squeezes the outer wall of the protrusion 51. When the limiting member 40 engages with the other side wall of the groove structure 21 in the second position, the dose feedback component on the metering dial support 20 is retracted inward and the locking teeth of the first feedback mechanism 55 and the ratchet teeth of the second feedback mechanism 70 can still cooperate, generating a tactile sensation in the second direction and feedback that the set dose is being corrected.

[0015] Furthermore, a first arc surface 553 is provided between the tooth edge segment 551 of the locking tooth and the guide surface 552, and a second arc surface 73 is provided between the abutting surface 71 and the contact surface 72 of the ratchet. When the measuring scale support 20 rotates in the second direction, the first arc surface 553 contacts the second arc surface 73, and the second arc surface 73 presses against the first arc surface 553, causing the locking tooth to retract inward, thereby correcting the set dosage. When the second arc surface 73 does not press against the first arc surface 553, the tooth edge segment 551 of the locking tooth impacts one side of the ratchet, emitting a sound that feedback is that the set dosage is being corrected.

[0016] Furthermore, the protrusion 51 is provided with a first curved surface 511, which transitions from the outer wall of the measuring scale support 20 to the highest point of the protrusion 51, thereby facilitating the contact between the limiting member 40 and the highest point of the protrusion 51.

[0017] Furthermore, the outer wall of the spring arm 52 is provided with a protrusion 53. When the limiting member 40 moves toward the injection end along with the screw sleeve 30, the limiting member 40 presses the protrusion 53 inward, so that the first feedback mechanism 55 and the second feedback mechanism 70 are completely disengaged, which facilitates the injection of the injection pen.

[0018] Furthermore, the upper part of the protrusion 53 is provided with a second curved surface 531, which transitions from the outer wall of the measuring scale support 20 to the highest point of the protrusion 53, thereby facilitating the contact between the limiting member 40 and the highest point of the protrusion 53.

[0019] Furthermore, the contact portion between the limiting member 40 and the protrusion 53 is a first inclined surface 41 extending from the inside to the outside, thereby providing guidance.

[0020] Furthermore, the opposite surface of the first inclined surface 41 of the limiting member 40 is the second inclined surface 42. The second inclined surface 42 is located on the outer wall of the limiting member 40 to prevent contact with the ratchet when the limiting member 40 presses the protrusion 53 inward, causing the first feedback mechanism 55 to completely disengage from the second feedback mechanism 70, thereby generating friction and affecting the injection of the injection pen.

[0021] In some embodiments, the dose feedback component is provided with a groove 56 at the connection between it and the metering dial support 20, so that the spring arm 52 can retract inward.

[0022] In some embodiments, the free end of the spring arm 52 is further provided with a notch 57 for avoiding the metering dial support 20 when adjusting the dosage.

[0023] The beneficial effects of the present invention: The present invention provides an adjustment feedback mechanism for an injection pen, including a metering dial support 20 and a main housing 60. The metering dial support 20 is sleeved with the main housing 60. The metering dial support 20 is used to cooperate with the metering dial 10 for dose display during dose adjustment. A screw sleeve 30 is sleeved inside the metering dial support 20. A dose feedback component is provided at the metering dial support 20. A first feedback mechanism 55 is provided at the dose feedback component. A second feedback mechanism 70 that cooperates with the first feedback mechanism 55 is provided at the main housing 60. A limiting member 40 is provided around the screw sleeve 30. The limiting member 40 is partially disposed outside the dose feedback component and has a gap. When the setting is... When setting the dosage, the measuring dial support 20 rotates in a first direction, and the limiting member 40 engages with the measuring dial support 20 at a first position. The first feedback mechanism 55 and the second feedback mechanism 70 cooperate to rotate and provide feedback on the dosage being set. When the set dosage needs to be corrected, the measuring dial support 20 rotates in a second direction, and the limiting member 40 engages with the measuring dial support 20 at a second position. This causes the dosage feedback component on the measuring dial support 20 to retract inward under the cooperation of the limiting member 40, achieving rotation in the second direction and providing feedback on the dosage being corrected. Because the dosage feedback component retracts inward, the measuring dial support 20 does not require much effort to rotate in the second direction when correcting the set dosage. Attached Figure Description

[0024] Figure 1 This is an overall installation diagram of the present invention.

[0025] Figure 2 This is a perspective view of the main housing of the present invention.

[0026] Figure 3 This is a perspective view of the dose feedback component of the present invention.

[0027] Figure 4 This is a perspective view of the limiting member of the present invention.

[0028] Figure 5 This is a structural diagram showing the downward movement of the limiting member of the present invention to contact the protrusion.

[0029] Figure 6 This is a structural diagram showing the downward movement of the limiting member of the present invention until it contacts the main housing.

[0030] Figure 7 This is a structural diagram of the toothed edge section of the first feedback mechanism and the contact surface of the second feedback mechanism of the present invention.

[0031] Figure 8 This is a structural diagram of the guide surface of the first feedback mechanism and the guide surface of the second feedback mechanism of the present invention.

[0032] Figure 9 This is a structural diagram of the first arc surface of the first feedback mechanism and the first arc surface of the second feedback mechanism of the present invention.

[0033] Explanation of main component symbols

[0034] Measuring dial 10; Measuring dial support 20; Groove structure 21; Screw sleeve 30; Limiting component 40; First inclined surface 41; Second inclined surface 42; Protrusion 51; First curved surface 511; Spring arm 52; Protrusion 53; Second curved surface 531; First feedback mechanism 55; Toothed edge section 551; Guide surface 552; First arc surface 553; Groove 56; Notch 57; Main housing 60; Second feedback mechanism 70; Abutment surface 71; Guide surface 72; First arc surface 73. Detailed Implementation

[0035] Example:

[0036] like Figure 1-3 As shown, an adjustment feedback mechanism for an injection pen includes a metering dial support 20 and a main housing 60. The metering dial support 20 is sleeved with the main housing 60. The metering dial support 20 is used to cooperate with the metering dial 10 for dose display during dose adjustment. A screw sleeve 30 is sleeved inside the metering dial support 20. A dose feedback component is provided at the metering dial support 20. A first feedback mechanism 55 is provided at the dose feedback component. A second feedback mechanism 70 that cooperates with the first feedback mechanism 55 is provided at the main housing 60. A limiting member 40 is provided around the screw sleeve 30. The limiting member 40 is partially disposed outside the dose feedback component and has a gap. When the dose is set, the metering... The dial support 20 rotates in a first direction, and the limiting member 40 engages with the metering dial support 20 at a first position. The first feedback mechanism 55 and the second feedback mechanism 70 cooperate to rotate and provide feedback on the setting of the dose. When the set dose needs to be corrected, the metering dial support 20 rotates in a second direction, and the limiting member 40 engages with the metering dial support 20 at a second position. This causes the dose feedback component on the metering dial support 20 to retract inward under the cooperation of the limiting member 40, thereby achieving rotation in the second direction and providing feedback on the correction of the set dose. Because the dose feedback component retracts inward, the metering dial support 20 does not require much effort to rotate in the second direction when correcting the set dose.

[0037] like Figure 3 and Figure 7As shown, the dose feedback assembly includes a spring arm 52 and a first feedback mechanism 55. The first feedback mechanism 55 is a locking tooth located at the free end of the outer wall of the spring arm 52. The second feedback mechanism 70 is a ring of ratchet teeth that cooperate with the locking tooth. A measurement unit is defined as the locking tooth moving from one ratchet tooth to its adjacent ratchet tooth. The locking tooth is provided with a tooth edge section 551 that engages with the ratchet tooth in a first direction. The tooth edge section 551 abuts against one side of the ratchet tooth when the metering dial support 20 rotates in the first direction, thereby fixing the set dose. The angle between the contact surface 71 of the tooth edge section 551 and the ratchet tooth and the horizontal direction is greater than 45° and less than 90° to prevent the locking tooth from rotating in a second direction.

[0038] like Figure 3 and Figure 8 As shown, the chuck is provided with a guide surface 552 that guides the ratchet in the first direction. When the metering dial support 20 rotates in the first direction, the guide surface 552 impacts and contacts the other side of the ratchet, causing the chuck to retract inward to set the dosage. The impact between the guide surface 552 and the other side of the ratchet produces a sound indicating that the dosage is being set. The contact angle between the guide surface 552 and the ratchet and the horizontal plane is greater than 90° and less than 180°, ensuring that the chuck can rotate smoothly in the first direction to set the dosage.

[0039] The junction between the measuring dial support 20 and the limiting member 40 is a groove-shaped structure 21. When the injection pen is not in use, a portion of the limiting member 40 is placed within the groove-shaped structure 21 and does not contact the side walls of the groove-shaped structure 21. When setting the dosage, the measuring dial support 20 rotates in a first direction, and the limiting member 40 engages with one side wall of the groove-shaped structure 21 at a first position. When the set dosage needs to be corrected, the measuring dial support 20 rotates in a second direction, and the limiting member 40 engages with the side wall of the groove-shaped structure 21 at a second position. The other sidewall of the groove structure 21 is joined at the second position, so that the dose feedback component on the measuring dial support 20 is retracted inward under the action of the limiting member 40 to achieve rotation in the second direction and feedback the dose being corrected. Since the dose feedback component retracts inward, the part of the limiting member 40 inside the groove structure 21 is a strip column structure. Only one end of the limiting member 40 is fixed to the outer wall of the measuring dial support 20, and the rest of the part does not contact the outer wall of the measuring dial support 20.

[0040] The outer wall of the dose feedback component is provided with a protrusion 51. When the set dose needs to be corrected, the metering dial support 20 rotates in the second direction. The limiting member 40 contacts the protrusion 51 and squeezes the outer wall of the protrusion 51. When the limiting member 40 engages with the other side wall of the groove structure 21 in the second position, the dose feedback component on the metering dial support 20 is retracted inward and the locking teeth of the first feedback mechanism 55 and the ratchet teeth of the second feedback mechanism 70 can still cooperate, generating a tactile sensation in the second direction and feedback that the set dose is being corrected.

[0041] like Figure 3 and Figure 9 As shown, a first arc surface 553 is provided between the tooth edge segment 551 of the locking tooth and the guide surface 552, and a second arc surface 73 is provided between the abutting surface 71 and the contact surface 72 of the ratchet. When the measuring dial support 20 rotates in the second direction, the first arc surface 553 contacts the second arc surface 73, and the second arc surface 73 presses the first arc surface 553, causing the locking tooth to retract inward, thereby correcting the set dosage. When the second arc surface 73 does not press the first arc surface 553, the tooth edge segment 551 of the locking tooth impacts one side of the ratchet, emitting a sound that feedback is that the set dosage is being corrected.

[0042] The protrusion 51 is provided with a first curved surface 511, which transitions from the outer wall of the measuring scale support 20 to the highest point of the protrusion 51, thereby facilitating the contact between the limiting member 40 and the highest point of the protrusion 51.

[0043] The outer wall of the spring arm 52 is provided with a protrusion 53. When the limiting member 40 moves toward the injection end with the screw sleeve 30, the limiting member 40 presses the protrusion 53 inward, so that the first feedback mechanism 55 and the second feedback mechanism 70 are completely disengaged, which facilitates the injection of the injection pen. The upper part of the protrusion 53 is provided with a second curved surface 531. The second curved surface 531 transitions from the outer wall of the measuring scale support 20 to the highest point of the protrusion 53, so as to facilitate the contact between the limiting member 40 and the highest point of the protrusion 53.

[0044] like Figure 4 and Figure 5 As shown, the contact portion between the limiting member 40 and the protrusion 53 is a first inclined surface 41 extending from the inside to the outside, which serves as a guide.

[0045] like Figure 4 and Figure 6 As shown, the opposite surface of the first inclined surface 41 of the limiting member 40 is the second inclined surface 42. The second inclined surface 42 is located on the outer wall of the limiting member 40 to prevent the ratchet from contacting when the limiting member 40 presses the protrusion 53 inward, causing the first feedback mechanism 55 and the second feedback mechanism 70 to completely disengage, thus affecting the injection of the injection pen.

[0046] like Figure 3 As shown, the dose feedback component is provided with a groove 56 at the connection between it and the metering dial support 20, which facilitates the inward retraction of the spring arm 52. The free end of the spring arm 52 is also provided with a notch 57, which is used to avoid the metering dial support 20 when adjusting the dose.

[0047] The beneficial effects of the present invention: The present invention provides an adjustment feedback mechanism for an injection pen, including a metering dial support 20 and a main housing 60. The metering dial support 20 is sleeved with the main housing 60. The metering dial support 20 is used to cooperate with the metering dial 10 for dose display during dose adjustment. A screw sleeve 30 is sleeved inside the metering dial support 20. A dose feedback component is provided at the metering dial support 20. A first feedback mechanism 55 is provided at the dose feedback component. A second feedback mechanism 70 that cooperates with the first feedback mechanism 55 is provided at the main housing 60. A limiting member 40 is provided around the screw sleeve 30. The limiting member 40 is partially disposed outside the dose feedback component and has a gap. When the setting is... When setting the dosage, the measuring dial support 20 rotates in a first direction, and the limiting member 40 engages with the measuring dial support 20 at a first position. The first feedback mechanism 55 and the second feedback mechanism 70 cooperate to rotate and provide feedback on the dosage being set. When the set dosage needs to be corrected, the measuring dial support 20 rotates in a second direction, and the limiting member 40 engages with the measuring dial support 20 at a second position. This causes the dosage feedback component on the measuring dial support 20 to retract inward under the cooperation of the limiting member 40, achieving rotation in the second direction and providing feedback on the dosage being corrected. Because the dosage feedback component retracts inward, the measuring dial support 20 does not require much effort to rotate in the second direction when correcting the set dosage.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An adjustment feedback mechanism for an injection pen, comprising a metering dial support and a main housing, wherein the metering dial support is sleeved with the main housing, the metering dial support is used to cooperate with the metering dial for dose display during dose adjustment, and a screw sleeve is sleeved inside the metering dial support, characterized in that: A dose feedback component is provided at the metering dial support, and a first feedback mechanism is provided at the dose feedback component. A second feedback mechanism that cooperates with the first feedback mechanism is provided at the main housing. A limiting member is provided around the screw sleeve, and a portion of the limiting member is located outside the dose feedback component and has a gap. When a dose is set, the metering dial support rotates in a first direction, and the limiting member engages with the metering dial support at a first position. The first feedback mechanism and the second feedback mechanism cooperate to rotate and provide feedback that the dose is being set. When the set dose needs to be corrected, the metering dial support rotates in a second direction, and the limiting member engages with the metering dial support at a second position, so that the dose feedback component on the metering dial support is positioned at the limiting member. Under the combined action of the limiting member, the dose feedback component on the metering dial support is retracted inward to achieve rotation in the second direction and provide feedback on the dose being corrected. The junction between the metering dial support and the limiting member is a groove-shaped structure. When the injection pen is not in use, part of the limiting member is placed inside the groove-shaped structure and does not contact the two side walls of the groove-shaped structure. When the dose is set, the metering dial support rotates in the first direction, and the limiting member engages with one side wall of the groove-shaped structure at the first position. When the dose needs to be corrected, the metering dial support rotates in the second direction, and the limiting member engages with the other side wall of the groove-shaped structure at the second position. This causes the dose feedback component on the metering dial support to retract inward under the combined action of the limiting member, achieving rotation in the second direction and providing feedback on the dose being corrected.

2. The adjustment feedback mechanism of the injection pen as described in claim 1, characterized in that: The dose feedback component includes a spring arm and a first feedback mechanism. The first feedback mechanism is a locking tooth located at the free end of the outer wall of the spring arm. The second feedback mechanism is a ring of ratchet teeth that cooperate with the locking tooth. A measurement unit is defined as the locking tooth moving from one ratchet tooth to its adjacent ratchet tooth.

3. The adjustment feedback mechanism of the injection pen as described in claim 2, characterized in that: The locking tooth has a toothed edge section that engages with the ratchet in a first direction. The toothed edge section abuts against one side of the ratchet when the metering dial support is rotated in the first direction, thereby fixing the set dose.

4. The adjustment feedback mechanism of the injection pen as described in claim 3, characterized in that: The cleat is provided with a guide surface that guides the ratchet in a first direction. When the metering dial support rotates in the first direction, the guide surface impacts and contacts the other side of the ratchet, causing the cleat to retract inward, thereby setting the dosage. The impact between the guide surface and the other side of the ratchet generates a sound indicating that the dosage is being set.

5. The adjustment feedback mechanism of the injection pen as described in claim 2, characterized in that: The outer wall of the dose feedback component is provided with a protrusion. When the set dose needs to be corrected, the metering dial support rotates in the second direction. The limiting member contacts the protrusion and squeezes the outer wall of the protrusion. When the limiting member engages with the other side wall of the groove structure in the second position, the dose feedback component on the metering dial support is retracted inward and the locking teeth of the first feedback mechanism and the ratchet teeth of the second feedback mechanism can still cooperate, generating a tactile sensation in the second direction and feedback that the set dose is being corrected.

6. The adjustment feedback mechanism of the injection pen as described in claim 4, characterized in that: The tooth edge of the chuck is provided with a first arc surface between the tooth edge and the guide surface, and the ratchet abutting surface is provided with a second arc surface between the contact surface and the contact surface. When the measuring dial support rotates in the second direction, the first arc surface contacts the second arc surface, and the second arc surface presses against the first arc surface, causing the chuck to contract inward, thereby correcting the set dosage. When the second arc surface does not press against the first arc surface, the tooth edge of the chuck impacts one side of the ratchet, emitting a sound that indicates that the set dosage is being corrected.

7. The adjustment feedback mechanism of the injection pen as described in claim 2, characterized in that: The outer wall of the spring arm is provided with a protrusion. When the limiting member moves toward the injection end with the screw sleeve, the limiting member squeezes the protrusion inward, so that the first feedback mechanism and the second feedback mechanism are completely separated, which facilitates the injection of the injection pen.

8. The adjustment feedback mechanism of the injection pen as described in claim 2, characterized in that: The dose feedback component is provided with a groove at the connection point with the metering dial support, which facilitates the inward retraction of the spring arm.

9. The adjustment feedback mechanism of the injection pen as described in claim 2, characterized in that: The free end of the spring arm is also provided with a notch to avoid the measuring dial support when adjusting the dosage.

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